1. The problem statement, all variables and given/known data A ball is thrown upwards at a speed of 29.4m/s Where is it 4 seconds after being released. 2. Relevant equations d=v0t+1/2at2 So I understand what the letters all stand for because that information is explained, but I don't know what to do with it. 3. The attempt at a solution The answer is 39.2. I don't know how or why because I don't understand basic mathematics notation. If a and t are next to each other like that am I supposed to multiply them by each other? But what about the half? Is it half of a (14.2), or is it half of a multiplied by t (58.8)? Then I multiply one of those numbers by itself because of the 2.. If I see a bunch of things together like that how do i know whether you multiply something by the next thing or the next 2 things or work with the others first then go back to that or... ? so d=0 (speed at beginning)x4 So that first part is just 0, right, i can ignore it? x 14.2 x 14.2 = 201.64... Argh I'm Also, can someone tell me where the half comes from in the equation? If someone could do the sum with all (and i mean all!) the rough work I think I'd be able to pick up what I am supposed to do. I used to be able to do this but I haven't done anything except add and subtract in 12 years.